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Question
(a) Calculate the electric field strength near a 10.0 cm diameter conducting sphere that has 1.00 C of excess charge on it. (b) What is unreasonable about this result? (c) Which assumptions are responsible?
1. $3.60\times 10^{12}\textrm{ N/C}$
2. This electric field is too large in air. Dielectric breakdown occurs at $3\times 10^{6}\textrm{ N/C}$, which is many orders of magnitude less than the field outside this sphere. Sparks would occur before reaching the field strength of $3.60\times 10^{12}\textrm{ N/C}$
3. The $1.00\textrm{ C}$ charge is excessive.
Solution Video